coll/index: Remove redundant "sed" filter

The particularly filter is only interesting if tar should start
"lying" about what files are hardlink.  Particularly, L::Collect will
on load mess with that data anyway to ensure stable ordering of
hardlinks.

Signed-off-by: Niels Thykier <niels@thykier.net>
L::C::Package: Optimize hardlink "sorting"

First off, skip hardlink sorting if there are no hardlinks.  Secondly,
reduce the number of files to check.

Signed-off-by: Niels Thykier <niels@thykier.net>